Pressure Transducer

Setra Systems Model 267 and 267MR pressure transducers sense gauge (static) or differential pressure and convert this pressure difference to a proportional electrical output. The 267 series is offered with a high level voltage output or 4-20 mA current output. The 267MR offers multi-range capability and field configurable 0-5 VDC or 0-10 VDC output, as well as a 4-20 mA output. The 267 is a single range unit and offers an optional LCD display. The 267 series has an IP65/NEMA 4 rated package to withstand environmental effects.

The 267 Series is available with an optional integral static pressure probe. Installation is quick and easy by mounting this version directly onto the duct. The 0.25" diameter pressure probe is made of sturdy extruded aluminum and is designed with baffles to prevent any velocity pressure errors.

Used in Building Energy Management Systems, the 267 and 267MR pressure transducers are available for air pressure ranges as low as 0.1 in W.C. (25 Pa) full scale to 100 in. W.C. (25 kPa) full scale. Static accuracy is ±1% full scale in normal ambient temperature environments.

The 267 series utilizes an improved all stainless steel micro-tig welded sensor, which is enclosed in a welded stainless steel body. The tensioned stainless steel diaphragm and insulated stainless steel electrode, positioned close to the diaphragm, form a variable capacitor. As the pressure increases or decreases, the capacitance changes. The change in capacitance is detected and converted to a linear DC electrical signal by Setra's unique electronic circuit.

The micro-tig welded tension sensor allows up to 10 psi overpressure (in either direction), with no damage to the unit. The improved sensor design also allows the Model 267MR version to have 6 field selectable pressure ranges (bi-directional and unidirectional) in one unit. With minimal effort, the user can field calibrate the unit with a fiip of a switch and be assured of optimum performance.